Method of making brush tips



Patented Sept. 16, Y 1952 METHOD 'OF MAKING BRUSH TIPS Walton 0. Marsh, Belleville, Ill., assignor to Marsh Stencil Machine Company, Belleville.' Ill., a corporation of Illinois Application July 19,1948, Serial No. 39,470

1 clans. 1

The present invention relates generally to the stenciling art, and more particularly to a method of making astencil brush tip.

An object 'of the present invention is to provide a novel method of forming a brush `tip by means of which an effective and durable brush tip vis achieved.

Another object is to provide a novel method of making a brush tip which is simple in its step sequence and which may be readily followed without the requirement of intensive instruction.

Another object is to provide a novel method of making a brush tip by means of which a well formed wear-resisting compact brush tip adapted to readily receive and distribute stenciling ink or other fluid is effected.

The foregoing and other objects and advantages are apparent from the following descriptionl taken with the accompanying drawing, in which:

Fig. 1 is a side elevational view of a bundle of bristles bound centrally of the ends by a threaded brush tip ring;

Fig. 2 is a side elevational view of the bundle of bristles of Fig. 1 shown disposed in a pan of cement, the pan being shown in vertical cross section;

Fig. 3 is a side elevational view of the ringbound bundle of bristles with the lower end of a pointed member disposed adjacent to and centrally of the glue-applied end of the bristles;

Fig. 4 is a bottom plan view of a plunger forming part of a pressure-applying machine which is not shown;

Fig. 5 is a plan view of a ring supporting platform of a pressure-applying machine;

Fig. 6 is a side elevational View of the ringbound bundle of bristles supported in a pressureapplying machine, a cap member and the plunger of the machine being shown adjacent the glueapplied end of the bristles;

Fig. 'l is a view similar to Fig. 5, but with the machine plunger against the cap disposed on the glue-applied end of the bristles, the bristles being shown forced partly through the ring; and

Fig. 8 is a vertical cross-sectional view through a completed stencil brush tip formed in accordance with the teachings of the present invention.

The present novel method of making stencil brush tips is best explained by reference to the accompanying drawing. A predetermined quantity or batch of bristles I0, preferably China bristle and about two and one-half inches in length, is inserted through a ring l2 having ex- '2 terior Ythreads I4 for a Vportion of the depth thereof. The ring A'I2 vis initially located substantially midway between the vends of the bristles I 0 and nts snugly. AThe batch of ring-bound bristles 4Ill 'is disposed on one end in a pan I6 of cement I8 and permitted to remain there for substantially 'an hour. It has been determined that in about an hour a suitable cement I8 of shallow depth will rise into the bristles I0 to a height of substantially one-half inch, or to about the broken line A.

The batch of bristles I0 is removed from the cement I8, and, while the cement within the end of the bristles I0 is still unset, a pointed member 20 is inserted into the glue-applied end of the bristles I0 to form a well 22 of substantially the configuration shown in Fig. 8. An annular cap member 24 of substantially the inner diameter of the ring I2 havingl a centrally located frustoconical depending flange 26 is disposed on the glue-applied end of the bristles I0 with the flange 2B depending into the well 22.

Thev batch of bristles l0 is then disposed in the U-shaped opening 28 of a supporting anvil or platform 30 of a pressure-applying machine (not shown) the lowermost of the threads I4 of the ring I2 resting upon a shoulder 32 preferably having the same pitch as the threads I4 in order to dispose the ring I2 and bristles I0 ver-A tically, as is shown in Figs. 6 and 7. A plunger 34 having an annular inset platform 36 from which a frusto-conical shaped centrally disposed projection 38 extends, forming part of the pressure-applying machine, is brought against the cap 24 and pressure applied to force the'bristles I0 downwardly through the ring l2 until the upper end of the bristles I0 and the cap 24 are in positions in respect to the ring I2 as is clearly shown in Fig. 3. It is to be noted that the cap 24 is a fraction of an inch below the upper edge of the ring I2 to provide a recess 40 which snugly receives a washer (not shown). The platform 36 is of smaller diameter than the internal diameter of the ring I2.

The bristles l0 and the cap 24 will be firmly held in the ring I2. The bristles Il] will be secured to the interior face of the ring I2 both by cement I8 and friction, the latter due to the fact that the depending frusto-conical flange 26 of the cap 24 reduces the cross section of the space originally provided for the bristles I0, and, hence, provides a very snug fit at the top, as is evidenced from Fig. 8. The bristles Ill are held rmly to each other by the cement I8, and, hence, do not pull out in use.

It is manifest from the foregoing that the applicants novel method of forming a brush tip achieves the objects and advantages sought therefor.

It is to be understood that the foregoing description and the accompanying drawing have been given by way of illustration and example. It is also to be understood that substitution of equivalent steps and rearrangement of steps, which will be readily apparent to one skilled in the art, are contemplated as within the scope of the present invention, which is limited only by the claim which follows.

What is claimed is: vy A method of making fountain brush tips comprising the steps of inserting a selected batch of bristles in longitudinal relationship into a ring and disposing the ring in a position well removed from one end of said batch so as to leave said bristles at said end in loose, uncompressed relation, submerging said end in a liquid cement to a level below said ring for further capillary rise of the cement between the bristles of said brush to a level above said liquid level, but below said ring, withdrawing the ring and the enclosed bristles, inserting and removing a forming tool in the cement-applied end of the bristles while 4 the cement is still wet so as to form a well in said end extending through and beyond the cementapplied portion of said bristles and to expand the diameter of said end, applying to the expanded cement-applied end a flat cap having an open frusta-conical projection extending partially into the formed well, supporting the ring, bristles and cap by engaging the ring and applying pressure to the expanded cement-applied end of said brush through the cap to cause said expanded end to move toward and through said ring in forcing engagement therewith until the cap at said expanded end is within the inner wall of said ring at a predetermined depth.

WALTON C. MARSH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

